﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


class CirclePerimeterAndArea
{
    static void Main(string[] args)
    {
        Console.Write("Radius r (cm) = ");
        double radius = Convert.ToDouble(Console.ReadLine());
        double circlePerimeter = (2 * Math.PI * radius);
        double circleArea = (Math.PI * (radius * radius));
        Console.WriteLine("The circle perimeter is {0:F2} cm", circlePerimeter);
        Console.WriteLine("The circle area is {0:F2} cm/2", circleArea);
    }
}

